Which rule differentiates between power-driven and sailing vessels?

Answer: B — Rule 18

The rule that distinguishes between power-driven vessels and sailing vessels is Rule 18. This rule is part of the International Regulations for Preventing Collisions at Sea (COLREGs), which provides guidance on the responsibilities of vessels in various situations to prevent collisions. Rule 18 specifically lays out the responsibilities of different types of vessels when they encounter each other. In Rule 18, distinctions are made based on the fact that sailing vessels under sail alone are generally given priority over power-driven vessels in certain scenarios. It outlines the rights of way for various types of vessels, such as vessels engaged in fishing, vessels not under command, and those restricted in their ability to maneuver. Understanding this rule is crucial for navigating safely and adhering to maritime navigation regulations. The other options do not pertain specifically to the differentiation between power-driven and sailing vessels. Rule 6 deals with safe speed; Rule 23 discusses the lights and shapes of sailing vessels under sail; and Rule 2 states the general principle of responsibility for compliance with the rules, but none directly address the distinctions between the types of vessels.